Grinding mill



Sept. 23, l9`41. w. HARDINGE GRINDING MILL' Filed OCt. 5, 1938...ii/.lli

R. m FVE W.

, yet a further form of mill.

Patented 'Sept 23,1941

. UNITED STATE GRINDING MILL Harry W.

Hardinxe, Forest Hills, N: Y.

Application October 5, 1938, Serial No. 233,433

1 Claim.

This invention relates to mills for grinding materials'such as, metal,ore, cement, coal or the particularly to an improvement in multiple feedand discharge mills employing or the material itself for the grindingmedia and using a liquid, a gas, or the material itself as a conveyingmedia. The present invention utilizes the inherent mechanical featuresof my original conical mill that is covered in Patent No; 908,861.

4One object of this invention is to provide a mill of the type underconsideration wherein the material to be worked upon is fed into one endvof the mill and discharged through the same end or through the oppositeend.

Another object is to provide a mill wherein the material to be groundorsdlsintegrated may be fed into both ends of the mill and dischargedfrom both ends of the mill.

And another object of this invention is to provide a grinding millwherein the material' to be disintegrated may be fed in through both oreither ends of the mill and peripheral ports provided in the mill.

A further bject is to provide a grinding mill wherein the hollowsupporting trunnions have extending therethrough means. material to bevfed into the mill; also serving as a discharge for the material.I

may be secured in place in any desirable manner.

discharged through With these and other objects in view, which may beincident to my improvements, the invention consists in the parts andcombinations to be material l will travel' up hereinafter set forth andclaimed, with the understanding that the several necessary elementscomprising my invention may struction, proportions and arrangements,without departing from the spirit and scope of the appended claim.

In the drawing:

Figure 1 isa longitudinal sectional view of one form of my invention.

be varied in con- Figure 2 is a longitudinal sectional view of a lfurther embodiment of my invention.

Figure 3 is a detail view, partly in section, of

Referring to Figure l, I have shown a grinding mill having an outershell'which formstwo conical compartments or sections l. end of eachsection I is closed by and it will be noted that adjacent to each endwall there is provided a cylindrical section 5. The end walls of theshell are formed with hollow trunnions 6 suitably journaled in supports,and as will hereinafter be described, the trunnions serve as dischargeopenings for the interior of the shell. l

It will be noted that the conical compartments i, the cylindricalsection 5 and the side walls are provided with a lining 1 which conformsto the contour of these particular parts, and the an end wall,

ure 1, the

' A feed tube 3 extends into each hollow trunnion 6 and is concentrictherewith, and each tube is supported in any suitable manner (notshown). The material to be ground is admitted into the interior of themill through the feeding tube 3 by using a gas or a liquid as aconveyor. The linest of the ground material, will be conveyed by thecurrent toward and discharged from the' outlets 8, as clearly indicatedby the arrows. The coarser material that is not sufciently `subdividedwill drop into the mass of grinding media 2 within the compa ments forfurther coin- .minution owing to the reduction of its velocity in thelarger diameter of the mill. Another particular advantage of the presentconstruction is that the larger particles of feed, instead of acting onthe end walls of the mill as an air and material blast when gas' orliquid under pressure is used, will impinge on the incoming blast fromthe opposite feed tube 3.

In each section i,"the grinding media 2 will classify automaticallyaccording to size and weight. The largest grinding media will remain atthe base of the cones where the material entering through the feed line3 is crushed by the largest grinding media having the greatestsuperincumbent weight, the greatest height of fall and the highestperipheral speed. The smaller grinding media and the finer ground thecone toward the more restricted portion of the mill from which theground material will oat toward the outlets B.

When the ground material is moving toward the outlet 6, and a gaseousconveying medium is being used, the diminishedvelocity of the current ofoutgoing conveying medium in the largest diameter region of the millcauses said gaseous medium to deposit any oversize material among thegrinding media 2 for further reduction. It will be appreciated that theinterior of the mill thus becomes a classifier and at the same timeretains its well known characteristics as a con- `ical mill.

In Figure 2, I have shown a somewhatdiierent form of construction thatmay be employed.

It will be noted that .a cylindrical outer .shell is provided and theinterior surface is so formed as toA provide two truncated cones I', theapices of which are adjacent to the center of the shell and the bases ofwhich are adjacent to the end walls.l

A cylindrical each apex of the cones. As was the case of Figinnerportion of the shell, the conical compartments l', dricalsection 5 areprovided-with a lining 1'.

' In Figure 3, I have shown a construction which may beemployed when' itis desired to discharge lining the material through ports provided inthepeportion 5.a. is positioned betweenv the end walls and the vcylinriphery of theoi the mill. In this that the shell and lining 1" shellintermediate the end walls em ent, it can be seen plurality of aperturesor ports 8. While the ports Feeding at oneend Feeding at both Feeding atone end Feeding at one end and Feeding at one *endv and dischargingthrough opposite end.

and discharging through same end.

. Feeding at both ends and discharging through either end.

ends and discharging through both ends.

and discharging at both en Feeding at both ends and discharging throughlperipheral ports in shell.

discharging through peripheral ports in shell.

' While I have shown and described the preaaneen ien-ed embodiment of myinvention, I wish it to be understood that I dg not confine myself tothe HARRY W. HARDmGn.

